Claude Code v2.1.283

What's changed

• Added x-claude-code-prompt-id to the gateway hint headers so LLM gateways can group the requests that serve one user prompt; opt in with CLAUDE_CODE_GATEWAY_HINT_HEADERS=1
• Added availableModelsMatch managed setting: with "exact", an availableModels entry allows only the model version it names, so new releases stay blocked until listed
• Added deniedModels managed setting to block specific models, even when availableModels allows them
• Added MCP tool, WebFetch and WebSearch outputs to the tool.output OpenTelemetry span event when OTEL_LOG_TOOL_CONTENT=1
• Added /doctor prompt-audit (also /checkup prompt-audit) to audit your CLAUDE.md files, skills, agents and commands for prompting patterns written for older models
• Added click-to-expand for truncated messages from your other sessions in fullscreen mode
• Added path to --plugin-dir load-failure entries in the stream-json system/init plugin_errors, naming the directory that did not load
• Added an opt-in load_test_mode block to the Claude apps gateway config: requests are built and signed but not sent upstream, and clients get a canned reply, so a deployment can be load tested
• Added a mantle upstream provider to the Claude apps gateway for Amazon Bedrock's Mantle endpoint
• Fixed SDK sessions losing a deferred tool call or finished tool result when a turn ended early, a held approval prompt after a worker restart, and a non-streaming fallback's result.usage
• Fixed MCP progress notifications being discarded once a long-running tool call moved to the background; the background task now shows the latest progress
• Fixed stdio MCP servers being left running when the session ended while they were still starting
• Fixed a brief HTTP 404 from a stateless remote MCP server (for example a proxy mid-redeploy) leaving that server unusable for the rest of the session while still shown as connected
• Fixed MCP sign-in for a server with no valid URL failing with an opaque SDK error; /mcp no longer offers Authenticate for such servers
• Fixed the weekly Fable limit not appearing in /usage and the VS Code usage meters when telemetry is disabled
• Fixed /model accepting Sonnet 4.6 or Sonnet 5 with [1m] when the id carried a date or -v1:0 suffix, in the cases where the plain id was refused
• Fixed /model picker showing a hardcoded Haiku version and price when ANTHROPIC_DEFAULT_HAIKU_MODEL pins a different model
• Fixed dynamic workflows started during a model fallback running every agent on the fallback model instead of retrying the configured model
• Fixed DISABLE_PROMPT_CACHING_HAIKU having no effect when Haiku is the session's main model
• Fixed claude plugin validate saying Claude Code accepts a plugin or marketplace name it cannot install; such names in marketplace.json now fail validation
• Fixed claude plugin validate passing plugins whose outputStyles, themes, monitors, or lspServers paths are missing or point outside the plugin directory
• Fixed claude plugin details showing 0 MCP servers for plugins that declare their servers in plugin.json
• Fixed claude plugin marketplace remove not saying which installed plugins it uninstalled with the marketplace; it now lists them
• Fixed claude plugin uninstall removing the other of two installed plugins whose ids differ only in case, with its options and secrets, when the one named had no enabledPlugins entry at that scope
• Fixed plugins that declare no version being silently restored at their source's newest commit, not the installed one, when their cached files were missing
• Fixed user-installed plugins and marketplaces failing to load with "cache-miss" after the home or config directory was moved, for example in bind-mounted devcontainers
• Fixed installed_plugins.json showing no plugins when it holds a record under an invalid plugin id; such a file loads again
• Fixed installed_plugins.json being rewritten, losing records, when it hol